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Tonescales for geographically localized digital rendition of people

a digital rendition and tone scale technology, applied in the field of digital image processing and enhancement, can solve the problems of not addressing the implementation of a global tone reproduction curve optimized for the rendition of people with a wide range of skin tones, causing peoples faces to be harsh, and dupin does not teach or offer any direction regarding the use or adjustment of algorithms, so as to improve the rendering of skin tones and improve the effect of people's appearan

Inactive Publication Date: 2006-04-13
MONUMENT PEAK VENTURES LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0016] It is an advantageous effect of the invention that improved methods and systems are provided which have an improved rendering of skin tones and an improved rendering of people overall.

Problems solved by technology

While Patton identifies contrast of the face as one of the parameters that can be customized, the issue of implementing a global tone reproduction curve optimized for the rendition of people with a wide range of skin tones is not addressed.
Dupin does not teach or offer any direction concerning use or adjustment of the algorithm for regional or cultural preferences for skin brightness levels.
While this type of curve may provide “snappy” reproductions of certain types of scenes, it tends to create a harsh look of peoples faces.
The approach is complex and processing intensive.
While such low slopes provide a smooth appearance of skin tones, it has been determined that the image, including the face, often looks too flat, with shadows having a tendency to look gray and relatively harsh transitions towards highlights.
Moreover, they tend ignore the importance of a smooth texture and overall appearance of human faces in image reproductions of people.

Method used

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  • Tonescales for geographically localized digital rendition of people
  • Tonescales for geographically localized digital rendition of people
  • Tonescales for geographically localized digital rendition of people

Examples

Experimental program
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Effect test

example 1

[0088] In a particular embodiment, exposed Kodak Gold 200 Gen. 6 film is processed by Kodak™ Flexicolorm C-41 chemical development and submitted to a digital mini lab for printing. Kodak Gold 200 film was used as a representative example of color negative films from a variety of vendors.

[0089] The processed roll of film was submitted to a digital mini lab for printing. Referring to FIG. 9, the digital mini lab 100 includes a scanner 104, which is designed to receive and scan a roll of developed film 102. The roll of developed film 102 is transported past a sensor in scanner 104, which scans the images on the film 102 so as to provide a digital record of the customer images. The scanner 104 scans at a resolution sufficient to provide the desired quality prints, preferably, at a resolution of at least 1000×1500 pixels per inch for a 35 mm film frame, and more preferably at a high resolution equal to or greater than about 2000×3000 pixels per inch for the 35 mm film frame. Examples of...

example 2

[0109] In another embodiment, the image is captured using a digital camera, e.g., Kodak DX 6490, and printed on a Kodak Picture Maker® kiosk on thermal paper. For smooth skin tone reproduction on a 4×6 inch print without visible digital artifacts the sensor must at least have a resolution of 2 Megapixels, preferably above 3 Megapixels. Higher sensor resolutions are required for larger size prints. FIG. 13 describes the elements of the digital camera 52 which are necessary for practicing the invention. The digital camera 52 includes an electronic display as optical viewfinder for composing a scene (not shown), a 10:1 zoom lens 184 controlled by a zoom lens driver (not shown) which is in turn controlled by a processor 198. The zoom lens 184 includes an adjustable aperture and shutter (labeled as exposure and focus control 188) for focusing light from a scene onto an image sensor 188. The camera may also include a flash unit 190.

[0110] The image sensor 188 is in this case a single-chi...

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Abstract

In a method and system for processing a photographic image having lightness values, L*, representing one of the colorimetric values of an original scene, the photographic image is transformed. The transformed image has a gamma as a function of CIE 1976 L*, which includes a dark region having a rising slope, a light region having a falling slope, and a plateau region having a slope constantly within 5 percent of a maximum value in said plateau region. The rising slope is at least twice as large as the absolute value of the falling slope. The plateau region is between 10 L* and 30 L* wide. Gamma is a derivative of visually perceived reproduced CIE 1976 L* versus scene CIE 1976 L*. Gamma has a maximum slope between 1.5 and 2.0.

Description

FIELD OF THE INVENTION [0001] The invention relates to digital image processing and enhancement and more particularly relates to methods and apparatus directed to tonescales for geographically localized digital rendition of people. BACKGROUND OF THE INVENTION [0002] It has long been recognized that the rendition of people is one of the most important aspects of color rendition. Consequently, a significant amount of research has been done in the field of the optimum color and tone reproduction of skin tones (D. L. MacAdam, Proc. I.R.E., 42, 1954, 166; R. W. G. Hunt, I. T. Pitt, L. M. Winter, “The Preferred Reproduction of Blue Sky, Green Grass and Caucasian Skin in Colour Photography”, J. Photogr. Science 22, 144,1974; M. Yamamoto, Y -H Lim, X. Wei, M. Inui, H. Kobayashi, “On the Preferred Flesh Colour in Japan, China and South Korea”, The Imaging Science Journal, 51, 163, 2003). This literature indicates that preferences for the rendition of skin tones may differ by geographic regio...

Claims

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Application Information

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IPC IPC(8): H04N1/60
CPCH04N1/6027
Inventor TOPFER, KARINBRUST, THOMAS B.KELLER, BRENTJIN, ELAINE W.
Owner MONUMENT PEAK VENTURES LLC
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